<template>
    <!-- 整个页面区域 -->
    <div class="login_container">
        <!-- 中间白色的盒子区域 -->
        <div class="login_box">
          <div class="avatar_box">
            <img src="../assets/logo.png" alt="">
          </div>
          <el-form ref="loginFormRef" :model="loginForm" class="login_form" :rules="loginFormRules">
            <el-form-item prop="username">
              <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username"></el-input>
            </el-form-item>
            <el-form-item prop="password">
              <el-input prefix-icon="iconfont icon-3702mima" v-model="loginForm.password"></el-input>
            </el-form-item>
            <el-form-item class="btns">
              <el-button type="primary" @click="login">登录</el-button>
              <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
          </el-form>
        </div>
    </div>
</template>
<script>
export default {
  data () {
    return {
      loginForm:{
        username:'',
        password:''
      },
      loginFormRules:{
        //验证用户名
        username:[
          {required:true,message:'请输入用户名',trigger:'blur'},
          {min:3,max:10,message:'长度在3到10个字符之间',trigger:'blur'}
        ],
        //验证密码是否合法
        password:[
          {required:true,message:'请输入登录密码',trigger:'blur'},
          {min:6,max:15,message:'长度在6眼15个字符之间',trigger:'blur'}
        ]
      }
    };
  },
    methods:{
      resetLoginForm(){
        this.$refs.loginFormRef.resetFields()
      },
      login(){
        this.$refs.loginFormRef.validate(async valid=>{
          // console.log(valid)
          if(!valid)return 
          const {data:res} = await this.$http.post('login',this.loginForm)
          if(res.meta.status != 200)return this.$message.error('登录失败')
          this.$message.success('登录成功')
          // 将登录成功之后的token保存到客户端的sessionStorage中
          // 项目中除了登录之外的其他api接口，必须在登录之后才能访问
          // token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
          // 通过编程式导航跳转到后台主页，路由地址是/home 
          window.sessionStorage.setItem('token',res.data.token)
          this.$router.push('/home')
        })
      }
    }
}
</script>
<style lang='less' scoped>
.login_container{
  background-color:#2b4b6b;
  height: 100%;
}
.login_box{
  width:450px;
  height:300px;
  background-color:#fff;
  border-radius: 3px;
  position: absolute;
  left:50%;
  top:50%;
  transform: translate(-50%,-50%);
}
 .avatar_box{
    height:130px;
    width:130px;
    border:1px solid #eee;
    //保证头像是圆的
    border-radius:50%;
    padding:10px;
    //添加阴影效果
    box-shadow:0 0 10px #ddd;
    position: absolute;
    left:50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
      width:100%;
      height:100%;
      border-radius:50%;
      background-color:#eee;
    }
  }

  .login_form{
    position: absolute;
    bottom: 0;
    left:0;
    width:100%;
    padding:0 20px;
    box-sizing: border-box;
  }
  .btns{
    display: flex;
    justify-content: flex-end;
  }
</style>